JP2010255197A - Dew condensation preventing method for curve mirror, dew condensation preventing device, and curve mirror - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dew condensation preventing method and a dew condensation preventing device for a curve mirror for preventing dew condensation inexpensively and achieving a stable satisfactory effect of dew condensation prevention. <P>SOLUTION: In this dew condensation preventing device, an airtight space R for shutting off the outside air is formed on a rear surface side of a mirror surface 10, the air inside the airtight space R warmed in the daytime is continuously stirred with a fan 25 at night, and the temperature on the mirror surface 10 is made the same as temperature inside the airtight space R. Since the temperature inside the airtight space R is always reduced behind the reduction in the outside air temperature, it is possible to prevent the temperature on the mirror surface 10 from being reduced below dew-point temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for preventing dew condensation on a road reflector, a dew prevention device for the road reflector, and a road reflector incorporating the dew prevention device for confirming a safety point that cannot be directly viewed through a reflection image by a mirror surface. .

  Road reflectors are installed at sharply curved places or T-shaped intersections on the road so that safety can be confirmed by reflection images by mirror surfaces. With regard to this road reflector, the phenomenon that the reflection confirmation image becomes unclear or cannot be formed due to condensation or frost formed due to icing due to weather conditions, and a phenomenon that the safety confirmation function is temporarily impaired may occur. It is considered more problematic and various measures for preventing condensation have been proposed (see the prior art document column below). However, in spite of various proposals, road reflectors with anti-condensation measures are not widely used at present.

  Condensation is a complex problem that involves the surrounding environment, such as the physical or chemical surface properties of the object to which condensation occurs, the magnitude of thermal conductivity, the presence or absence of wind, and the status of surrounding buildings. In particular, it is sufficient to assume that the mirror surface is generated by lowering below the dew point of the surrounding natural air. In other words, when the air contacted with the surface of the mirror surface of the road reflector is rapidly cooled to below the dew point, condensation occurs when the saturated water vapor is exposed to the mirror surface as fine water droplets. I can say that.

  Since the occurrence of condensation in road reflectors is based on the above-mentioned causes, as a measure to prevent the occurrence of condensation, the mirror surface temperature in the time zone where condensation is likely to occur is maintained at a temperature above the dew point. Countermeasures can be envisaged. In addition, from the viewpoint of securing the safety confirmation function, which is the purpose of installing the road reflector, it is only necessary to form a clear reflected image regardless of whether or not condensation occurs. When it occurs, it is possible to envisage a countermeasure that removes the generated condensation as soon as possible, or a countermeasure that prevents the condensation from forming a water droplet that hinders the formation of a reflection image on the mirror surface.

  Conventional proposals for the problem of condensation on road reflectors are based on one of the above ideas. However, the problem is the degree of achievement of the effects of adopting anti-condensation measures on road reflectors and the manufacturing cost. In addition, there is a need for a balance between an increase in burden including an increase in installation costs and maintenance costs. This is because if the increase in burden required to prevent condensation is excessive, the proposal will not be adopted after all even if the effect is recognized. That is, if maintaining the mirror surface of the road reflector at a temperature higher than the dew point is merely a technical problem, the solution is extremely easy. Another requirement is that the road reflectors will not harm the cityscape by adopting anti-condensation measures.

  From the above viewpoint, the problem in the conventional proposal, that is, the reason why the road reflecting mirror with anti-condensation measures is not popularized will be considered.

  As a countermeasure for preventing condensation in a road reflector, there is one in which a heating element is attached to the back side of the mirror surface (see Patent Document 2). It can be said that this is the simplest measure to keep the mirror surface at a temperature above the dew point. Moreover, what is provided with a heat generating body is normally provided with the control member containing the battery as a power supply, the solar cell panel for charging a battery, the control circuit for charging / discharging control, etc. This is because if a commercial power source is used, excessive incidental work will be involved. The control member includes a temperature sensor and the like. The battery and the control member in this reference are disposed inside a support pole for supporting the road reflector.

  A heating element that converts electric power into Joule heat is a heavy load that consumes a large amount of power when viewed from a solar panel or battery, and requires a large battery capacity and panel area. Therefore, the cost burden is large.

  There is one in which a wiper that rotates like a clock hand is attached to a mirror surface (see Patent Document 2). It is difficult to ensure the adhesion between the wiper and the mirror surface, and if the adhesion is improved, a large drive motor with high power consumption is required. In addition, wipers that are always present in the mirror reflection image may cause errors to the user when confirming safety.

  There is also a plan to blow air to a mirror surface using an electric fan (see Patent Document 2). This proposal is based on the fact that condensation does not occur on days with moderate wind. In this measure, although the effect of preventing condensation within a certain range from the center of the air blown by the fan is recognized, it is difficult to prevent condensation on the entire mirror surface. This is because it is difficult to diffuse the air from the fan over the entire mirror surface.

  The back side of the road reflector is usually protected by attaching a back cover or cover, but conversely, no back cover or cover is provided, and the back side of the mirror surface is directly exposed to the outside air in the same way as the front side. There is also a proposal for touching (see Patent Document 1).

  According to the above proposal, the mirror surface temperature can be made to coincide with the ambient temperature at an early stage so that condensation can be quickly removed by directly touching the outside air on the back surface side of the mirror surface. This allegation regarding the removal of condensation appears to be justified, but it cannot be denied that it does not contribute to the prevention of condensation.

  Proposal that a titanium oxide-based photocatalyst-containing layer is formed on the mirror surface and the condensation is diffused in the form of a water film on the mirror surface, so that a temporary reflection image can be obtained even when condensation occurs. (See Patent Document 4). That is, when the condensation is in the form of fine water droplets, it is difficult to obtain a normal reflection image due to the irregular reflection of the light beam, but when the condensation is in the form of a water film, there is a slight deterioration in the image quality. This is a proposal focusing on the fact that a reflected image can be secured.

However, in the above proposal, it is doubtful whether the photocatalyst functions normally at night and in the dawn time when condensation occurs, and even if it functions normally, the mirror surface temperature drops below freezing point, In the case where the dew condensation is frozen, it can be said that the function of forming the reflection image is completely impaired.

  There is a proposal to attach a heat storage agent to the back surface of the mirror surface, store heat in the daytime, and maintain the temperature of the mirror surface at dawn from the night (see Patent Document 3). Consideration has been given to the method of attaching the heat storage agent to the mirror surface and the prevention of freezing of the liquid phase heat storage agent. If the amount of heat stored in the heat storage agent is sufficient, it seems to be an effective technique. However, a soft resin container such as vinyl chloride is used for the heat storage agent container because it is necessary to improve the adhesion to the mirror surface. In this regard, there is a concern that the amount of resin waste increases in consideration of the lifetime of the road reflector. Moreover, in the technology using a heat storage agent, although rare, when the phenomenon of reversal of temperature day and night occurs, cold heat is stored in the heat storage agent, which may increase the occurrence of condensation. .

  There is a proposal for taking in air from a position higher than the installation position of the mirror surface and continuously supplying it to the back surface side of the mirror surface to maintain the mirror surface temperature at a temperature equal to or higher than the dew point (see Patent Document 5).

  The above proposal is our prior art. The weather conditions on the day when condensation occurs are almost always clear and windless. Under such weather conditions, the temperature of the air around the road reflector is not uniform, and cold and heavy air is present. It is a proposal based on observation data that subsided near the surface of the earth and warm and light air is layered on top of it in order.

  That is, the air at a position higher than the mirror surface installation position is relatively high with respect to the temperature of the air near the mirror surface, and the relatively high temperature air is continuously supplied to the air chamber on the back surface side of the mirror surface. Thus, the temperature of the entire mirror surface is heated to a temperature higher than the dew point of the surrounding air, and condensation can be effectively prevented. Although this proposal has a remarkable effect in preventing condensation, the presence of a cylinder for introducing air above the mirror surface to the back surface of the mirror surface causes visual discomfort and inconvenience in transportation and handling. I couldn't.

JP 7-229113 A JP-A-11-217806 Japanese Patent No. 3628364 Japanese Patent No. 3634630 JP 2002-105915 A

  As described above, various countermeasures for preventing condensation of road reflectors have both inherent effects and inherent problems. As described above, the fact that the road reflectors with these countermeasures are not widespread concludes that there is a problem in the balance between the inherent effect and the burden for obtaining the effect as described above.

  In our company, we examined the prototype of the road reflector described in our prior art document (Patent Document 5) to what extent the cylinder for guiding the air in the sky to the back side of the mirror surface can be shortened. . This is because this point was pointed out by the industry as a problem.

The result of the study was unexpected. That is, when the tube is gradually shortened and the result is observed, the condensation prevention effect gradually decreases, but when the length of the cylinder falls below a certain limit, the decrease in the condensation prevention effect stops decreasing. Even if the body was removed, as long as the air flow was continued, it was not sufficient, but a dew condensation prevention effect was obtained over the entire mirror surface. Note that the air blown into the air chamber on the back surface side of the mirror surface is diffused in a complicated manner throughout the air chamber and discharged from multiple points on the outer peripheral portion of the mirror surface.

  In general, when the surrounding air is blown to the surface of the mirror surface, only the local dew condensation prevention effect can be obtained, but when the air is blown to the air chamber on the back side of the mirror surface, the above-mentioned effect is obtained. It is estimated that the air in the air chamber is diffused in a complex manner by the blown air, and the temperature of the entire mirror surface is assumed to be the same as the outside air temperature, and instead of blowing cold outside air, the air chamber It was suggested that the effect of preventing dew condensation could be further enhanced if the air-tight space is made to diffuse and circulate the air in the air-tight space. In other words, when the outside air temperature is constant, the temperature inside the airtight space will eventually be assimilated to the outside air temperature, but in situations where the outside air temperature is constantly decreasing, the temperature inside the airtight space is lowered. This is because it always occurs late to the decrease in the outside air temperature.

  The present invention pays attention to the fact that the temperature drop in the airtight space that is blocked from the outside air is always delayed with respect to the drop in the outside air temperature. Condensation prevention method of road reflector and dew prevention device of road reflector that can achieve stable dew condensation prevention effect at low cost by the extremely simplified configuration of continuously stirring the air in the night And it aims at providing the road reflector incorporating a dew condensation prevention device. However, the battery used as the power source of the photovoltaic power generation panel or fan is not unnecessary.

  In order to achieve the above object, the present invention employs the following configuration.

According to a first aspect of the present invention, there is provided a method for preventing dew condensation on a road reflector, wherein an external airtight space is formed on the back side of the mirror surface to form an independent airtight space, and a photovoltaic power generation panel is installed outside the airtight space. A fan that drives a battery that is charged by a solar power generation panel as a power source is installed inside the airtight space, and the air inside the airtight space is maintained at night by detecting the sunshine state and controlling the on-off. And stirring.

  The said structure WHEREIN: The airtight space formed in the back surface side of a mirror surface is independent from external air, and can store the heat | fever by daylight etc. in the daytime. In addition, the temperature inside the airtight space decreases as the outside air temperature decreases, but the temperature decrease always occurs with a delay from the decrease in the outside air temperature. In addition, the air in the airtight space is continuously agitated by the fan at night, and therefore the temperature of the mirror surface is made equal to the temperature in the airtight space. Therefore, the mirror surface temperature is always kept relatively higher than the ambient air temperature, and as a result, the occurrence of condensation is effectively prevented.

  The dew condensation prevention method for a road reflector according to claim 2 of the present invention is based on the dew condensation prevention method according to claim 1 and includes a heater or a heat storage member inside an airtight space formed on the back side of the mirror surface. A heater is installed, the battery is float-charged by the solar power generation panel while detecting the charge state of the battery, and the power of the solar power generation panel during a period not used for charging the battery is used for the heater.

  The heater in the above configuration does not heat the mirror surface at night as in the prior art, but is energized by the solar power generation panel during a period not used for charging the battery in the daytime in order to heat the air in the airtight space. Is done. If the battery is charged more than necessary, its useful life is shortened. Therefore, after the battery voltage reaches a certain value, it is intermittently charged instead of continuously charged. The heater is energized using a period during which the battery is not charged. Since the temperature inside the airtight space can be increased by a heater in addition to daytime sunshine, the effect of preventing condensation at night can be further enhanced. In addition, when a heater is what accompanies a heat storage member, the heat storage capacity inside the airtight space can be further increased. Further, since the battery can be exclusively used for the fan, a battery with a small capacity is sufficient, and the utilization efficiency of the photovoltaic power generation panel is improved.

  In addition, the heater in the said structure shall include the thing used as a resistor besides the thing used as a heater as an electric element.

  The dew condensation prevention device for a road reflector according to claim 3 of the present invention includes a solar power generation panel that can be attached to an existing road reflector and a mirror back cover that can be attached to an existing road reflector. A fan attached to the inner side surface of the back cover, a battery charged by a photovoltaic power generation panel and used as a power source for the fan, and an electrical member including a charging circuit and a discharge circuit. When it is replaced with the mirror back cover of the road reflector, an airtight space is formed between the mirror surface and the electrical components attached to the inner surface of the mirror back cover. By performing OFF control, stirring is continuously performed at night while heat generated from the electrical component member is added to the air inside the airtight space.

  The dew prevention device for a road reflector having the above-described configuration is provided with a mirror back cover capable of forming an airtight space between the mirror surface and the mirror back cover of an existing road reflector when replaced. It is. Although this dew condensation prevention device embodies the dew condensation prevention method according to claim 1 as a device, for that purpose, it is necessary to form an airtight space on the back side of the mirror surface. However, the design of the back cover of the existing road reflector is various, and there are few that do not have the airtight space of the capacity required to implement the dew condensation prevention method according to claim 1 between the mirror surface. Absent. Therefore, the mirror back cover for forming the airtight space is included in the apparatus. In addition, the electrical components including the fan, battery, charging circuit, discharge circuit, etc., for agitating the air in the airtight space are attached to the inner surface of the mirror back cover, and there is no need for separate mounting work. At the same time as replacing the lid, it can be incorporated into an existing road reflector. The effect of preventing dew condensation can be enhanced by the heat generated from the electrical component incorporated in the airtight space.

  According to a fourth aspect of the present invention, there is provided an apparatus for preventing dew condensation on a road reflector, wherein a solar power generation panel that can be attached to an existing road reflector and an opening that is post-processed on a mirror back cover of the existing road reflector are airtight. A cover that forms an airtight space between the mirror and the mirror surface, a fan that is attached to the inner surface of the cover, a battery that is charged by a solar power generation panel to serve as a power source for the fan, a charging circuit, and a discharging circuit It is characterized by continuously stirring at night while adding heat generated from the electrical component to the air inside the airtight space by detecting the sunshine state and controlling the ON / OFF of the fan. And

  The dew condensation prevention device for a road mirror having the above configuration is used by being attached to an existing road reflection mirror in the same manner as the dew condensation prevention device according to claim 3. However, the existing road reflection mirror has a mirror surface and a mirror back surface. In this configuration, an airtight space that can be used is provided between the lid and the lid. That is, in this case, there is no need to replace the mirror back cover, and the opening is post-processed in the mirror back cover, and the present invention is simply implemented by airtightly closing the opening with a cover to which an electrical component is previously attached. be able to.

  The dew condensation prevention device for a road reflector according to claim 5 of the present invention is based on the dew condensation prevention device according to claim 3 or 4, and includes a heater provided with a heater or a heat storage member in an electrical component. The battery is float-charged by the photovoltaic power generation panel while detecting its charging state, and the power of the photovoltaic power generation panel during a period not used for charging the battery is used for the heater.

  A dew prevention device for a road reflector according to the above configuration embodies the dew condensation prevention method according to claim 2 as a device, and heats the power of the photovoltaic power generation panel during periods when it is not used in the daytime by a heater. It can be converted and stored in an airtight space. In addition, in the case of a heater, it is the same as the structure of Claim 2 that it is the meaning included in an electrical resistor.

  The road reflecting mirror according to claim 6 of the present invention incorporates the electrical component according to claim 4 or 5 in an airtight space formed between the photovoltaic panel and the mirror surface and the mirror back cover. It consists of a reflector body.

  The above-described configuration is a configuration for dealing with replacement or new installation of the entire road reflector. In the case of new construction, it is difficult to make the work conditions ideal by making it complete as a road reflector with a solar power generation panel and electrical components assembled in advance to prevent condensation. It can be avoided.

  In the method for preventing condensation of the road reflector according to the present invention, when an airtight space is provided on the back side of the mirror surface, attention is paid to the fact that the temperature drop in the airtight space at night always occurs with a delay from the temperature drop of the outside air. However, at night when the temperature gradually decreases from sunset to dawn, the air inside the airtight space is continuously stirred, so that the air temperature inside the airtight space and the temperature of the mirror surface are equalized. Since the temperature can always be kept relatively higher than the outside air temperature, a practically sufficient dew condensation prevention effect can be achieved with a very simplified configuration.

  The dew condensation prevention device for a road reflector according to the present invention includes a solar power generation panel that can be attached to an existing road reflector, and a mirror back cover for forming an airtight space by being attached to the back side of the mirror surface of the existing road reflector. And a fan for continuously agitating the air inside the airtight space at night and a battery charged by the solar power generation panel and used as a power source of the fan, thereby automatically preventing the condensation of the road reflector. Therefore, it is possible to easily add a dew condensation prevention function to an existing road reflector.

  The road reflector of the present invention incorporates the anti-condensation device for the road reflector of the present invention that automatically executes the method of preventing dew condensation of the road mirror of the present invention. To do.

It is sectional drawing of the principal part which shows embodiment of the road reflector of this invention. It is a perspective view which shows embodiment of the dew condensation prevention apparatus of this invention. It is a disassembled perspective view which shows the said embodiment. It is a block diagram which shows the structure of the electrical equipment member in the said embodiment. It is operation | movement explanatory drawing of the electrical equipment member in the said embodiment. It is sectional drawing of the principal part which shows other embodiment of the road reflector of this invention. It is a disassembled perspective view which shows other embodiment of the dew condensation prevention apparatus of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method and apparatus for preventing condensation of a road reflector and a road reflector having a condensation prevention function according to the present invention will be described below with reference to the drawings.

  The road reflector is composed of a photovoltaic power generation panel SP and a reflector main body MU (FIG. 1). However, if necessary, the equipment set including the support pole 1 and the mounting brackets 1A and 1B can be used.

  The photovoltaic power generation panel SP includes a stay with a cap 1 </ b> C that fits into the upper end portion of the support pole 1 on the back surface side, and can be attached to the upper end portion of the support pole 1 easily and freely adjustable in direction. In addition, about the inclination angle of the photovoltaic power generation panel SP, there is usually no problem as the angle is fixed, but for example, when it is planned to be used commonly in areas with extremely different latitudes, such as Hokkaido and Okinawa, A configuration capable of adjusting the angle can be employed.

  The mounting brackets 1A and 1B are a combination of a mounting bracket 1A that holds and fastens the upper and lower arbitrary positions of the support pole 1 and a mounting bracket 1B that is fixed to the back cover 21A of the reflector main body MU. In other words, it is a mounting bracket that can be said to be an industry standard, and by using the mounting brackets 1A and 1B, the vertical position and vertical angle of the reflector body MU can be easily set according to the conditions of the installation location. it can.

  The road reflector substantially includes a dew condensation prevention device 20 having a mirror back lid 21A of the present invention composed of a photovoltaic power generation panel SP and an electrical component E on a general mirror surface 10 made of resin or metal. It is a combined configuration. A hood 11 for preventing direct light is attached to the upper part of the mirror surface 10.

  The mirror surface back cover 21A in the dew condensation prevention device 20 of the present invention is a sheet metal processed product, and is formed into a shallow cone shape having a flange 2F set deeper than usual at the peripheral edge (FIGS. 1 to 3). . A mounting bracket 1B is fixed via a reinforcing plate 1E at the center position of the outer surface of the mirror back lid 21A. Further, an electrical component E is attached to the inner side surface of the mirror surface back cover 21A.

  The electrical member E includes a printed wiring board 22, a heater 23, a fan 25, and a battery pack 26 (FIGS. 1 and 3). The heater 23 has a planar shape and is attached to the back surface of the heat storage member 24. The heat storage member 24 is a metal lump, and the printed wiring board 22, the heater 23, the heat storage member 24, and the fan 25 are vertically moved through the spacer nuts 2 </ b> N so as to maintain an interval that can ensure good ventilation. Stacked. That is, these electrical components E can be attached as a single unit to the mirror back lid 21A. Similarly, the battery 26 can be attached as one pack.

  As described above, the heater 23 according to the present invention includes a heater whose element is used as a resistor. When a resistor is used, it is preferable that the element itself has sufficient heat capacity and robustness, such as cement resistance and enamel resistance. Further, the battery 26 according to the present invention may be any battery as long as it has a function as a secondary battery that can be charged and used repeatedly, and the type of battery is not particularly limited. For example, a lead seal battery can be exemplified as a preferable one from the viewpoints of cost, durability, capacity, outer size, and the like. Further, the battery 26 in the present invention includes a continuous discharge type capacitor, and when the capacitor is used, it can be mounted on the printed wiring board 22.

  The configuration of the electrical component E in the dew condensation prevention device 20 is such that the electric power from the photovoltaic power generation panel SP is supplied in parallel to the circuit C1 that supplies the electric power from the photovoltaic power generation panel SP to the battery 26 via the charging circuit CG, and the electric power from the photovoltaic power generation panel SP is charged. The circuit C2 is supplied to the heater 23 via the circuit, and the circuit C1 and the circuit C2 are alternately energized (FIG. 4). Therefore, the battery 26 is not connected to the heater 23 and is used only for driving the fan 25 through the discharge circuit DG.

  That is, the function content of the charging circuit CG is a means for distributing the supply power to the circuit C1 and the circuit C2 in synchronization with the floating charging timing to a charging circuit having a general constant voltage regulator and a floating charging function for preventing overcharge. The electronic changeover switch SW is added (FIG. 5). The changeover switch SW at this time closes the circuit C1 and opens the circuit C2 until the battery voltage V reaches a predetermined set value, and opens the open circuit C1 until the battery voltage V drops to the predetermined set value. At the same time, it operates to close the open circuit C2.

  On the other hand, the functional content of the discharge circuit DG is a motor drive circuit with a condition that the sunshine state is a condition, that is, the drive circuit of the fan 25, and the output voltage of the photovoltaic power generation panel SP drops below a predetermined set value. Alternatively, it is detected that it is nighttime through disappearance and the battery voltage V is supplied to the fan 25. Therefore, the discharge circuit DG includes voltage detection means for detecting the voltage of the photovoltaic power generation panel SP. Although it is possible to detect that it is nighttime using a dedicated sunshine sensor, it is reasonable to use the solar power generation panel SP itself as a sunshine sensor as described above.

  The above-described dew condensation preventing apparatus 20 of the present invention can be combined with the mirror surface 10 of an existing road reflector or a mirror surface 10 prepared for exclusive use to constitute a road reflector of the present invention having a dew condensation preventing function (FIG. 1). ).

That is, by attaching the mirror surface back cover 21A of the dew condensation prevention device 20 to the mirror surface 10, the reflecting mirror body MU having the airtight space R between the two and the electrical member E being housed in the airtight space R is formed. . Note that the airtight space R is not an airtight space in a strict sense, but is an airtight space R in a simple meaning in which, for example, the presence of a screw hole for a small screw is allowed.

  Here, it is assumed that effective solar radiation is obtained at the solar power generation panel SP with sunrise, and the battery voltage V is lowered by driving the fan 25 at night, the battery voltage V is set to the set value from the sunrise time T0. In the period T1 up to, the power of the photovoltaic power generation panel SP is supplied to the battery 26 via the charging circuit CG (FIG. 5). Next, in the period T <b> 2 until the battery voltage V drops to the set value, the power of the solar power generation panel SP is supplied to the heater 23. The charging circuit CG repeats the above operation until the sunset time TN, maintains the battery 26 in a fully charged state, and stores heat generated by the heater 23 in the heat storage member 24. At this time, heat generated from the charging circuit CG itself is also stored in the airtight space R.

  When the power generation operation of the solar power generation panel SP stops due to sunset, the discharge circuit DG detects a voltage drop or voltage loss of the solar power generation panel SP and supplies the battery voltage V to the fan 25. The fan 25 is continuously operated until the sunrise time T0 of the next day, and stirs the air inside the airtight space R. As a result, the temperature of the mirror surface 10 changes while substantially matching the temperature change inside the airtight space R.

  During the period from sunset to dawn, the outside temperature decreases every moment, and the temperature inside the airtight space R also decreases as the outside temperature decreases. At any time during this time, the temperature inside the airtight space R is kept relatively higher than the outside temperature at that time. This is because the temperature decrease inside the airtight space R is a result of a decrease in the outside air temperature. As a result, the temperature of the mirror surface 10 does not fall below the dew point, and condensation on the mirror surface 10 is reliably prevented.

  Here, it is important that the causal relationship between the change in the outside temperature and the change in the temperature inside the airtight space R is established as a natural law that is independent of the heat generated from the heater 23 and the electrical component E. . In other words, the dew condensation preventing effect of the dew condensation prevention method and the dew condensation prevention device 20 of the present invention is that the air inside the airtight space R is agitated by the fan 25, and the temperature of the mirror surface 10 is made equal to the air temperature inside the airtight space R. As long as it is not dependent on the heater 23 or the like.

  Hereinafter, other embodiments of the dew condensation preventing device 20 and the road reflector according to the present invention will be described focusing on differences from the above embodiments. (FIGS. 6 and 7). In addition, the code | symbol for contrast is attached | subjected also about the member which abbreviate | omits description since the content is the same.

  The dew condensation prevention device 20 includes a box-shaped cover 21B with one surface open, and the electrical member E is attached to the inner surface of the cover 21B. The cover 21B is made of metal or resin, and fixing flanges 2E are integrally formed around the four sides of the cover 21B, and a tapping screw or a blind rivet is inserted into each flange 2E. A through hole is provided for this purpose.

  The dew condensation prevention device 20 is attached so that the opening 2H is post-processed in the mirror back cover 21A and the opening 2H is closed by the cover 21B without removing the mirror back cover 21A of the existing road reflector. At this time, an airtight space R can be formed between the cover 21B and the mirror surface 10 by interposing a seal member having a large deformation amount between the flange 2E... Part of the cover 21B and the mirror back cover 21A. At the same time, the assembly of the electrical component E can be completed. In this case, it is difficult to place the electrical component E at the center position of the mirror surface 10 due to the existing mounting bracket 1B, but there is no problem as long as the air inside the airtight space R can be agitated.

  Such a dew condensation prevention device 20 can be used even when a space for directly incorporating the electrical component E cannot be secured between the mirror surface 10 of the existing road reflector and the mirror back cover 21A. There is an advantage that the application range of the dew condensation prevention device 20 can be greatly expanded.

  In addition, about the design of the cover 21B of the dew condensation prevention apparatus 20, it can be set as the exclusive design which adapts to the mirror surface back cover 21A of the road reflector of a specific kind or a specific specification. From the viewpoint of adjusting the appearance, it is also preferable for reliably forming the airtight space R. Moreover, the road reflector with the dew condensation prevention device 20 attached corresponds to another embodiment of the road reflector of the present invention.

SP Solar power generation panel MU Reflective mirror body R Airtight space E Electrical component 10 Mirror surface 2H Opening 21A Mirror surface back cover 21B Cover 23 Heater 24 Heat storage member 25 Fan 26 Battery

Claims (6)

  A separate airtight space is formed on the back side of the mirror surface by blocking the outside air, a solar power generation panel is installed outside the airtight space, and a battery charged by the solar power generation panel is driven as a power source inside the airtight space. A method for preventing dew condensation on a road reflector, wherein a fan is installed, and the air inside the airtight space is continuously stirred at night by detecting the sunshine state and controlling the on / off of the fan.   Solar power generation during a period when the battery is not used for charging the battery while installing a heater or a heater having a heat storage member inside the airtight space, and floatingly charging the battery with the solar power generation panel while detecting the charge state of the battery The method of preventing condensation on a road reflector according to claim 1, wherein the power of the panel is used for a heater. A solar power generation panel that can be attached to an existing road reflector, a mirror back cover that can be attached to an existing road reflector, a fan that is attached to the inner surface of the mirror back cover, and charging by the solar power generation panel A battery serving as a power source for the fan, and an electrical component including a charging circuit and a discharging circuit,
The mirror back cover, when combined with an existing road reflector, forms an airtight space in which the electrical component attached to the inner surface of the mirror back cover can be accommodated between the mirror surface and the fan. An apparatus for preventing dew condensation on a road reflector, characterized in that the state is detected and ON-OFF controlled to continuously stir at night while adding heat from the electrical component to the air inside the airtight space. A solar power generation panel that can be attached to an existing road reflector, and a cover that hermetically closes the post-processed opening on the mirror back cover of the existing road reflector and forms an airtight space between the mirror and the mirror surface. A fan attached to the inner surface of the cover, a battery charged by the photovoltaic power generation panel and used as a power source for the fan, and an electrical member comprising a charging circuit and a discharging circuit,
A road reflector that continuously stirs at night while adding heat generated by the electrical component to the air inside the airtight space by detecting the sunshine state and performing on-off control of the fan. Anti-condensation device.   The electric component includes a heater including a heater or a heat storage member, and the battery is float-charged by the solar power generation panel while detecting the state of charge of the battery, and the solar battery is not used for charging the battery. The dew condensation prevention device for a road reflector according to claim 3 or 4, wherein electric power of a photovoltaic panel is used for the heater. A road reflecting mirror comprising a photovoltaic power generation panel and a reflecting mirror body in which the electrical component according to claim 4 is incorporated in an airtight space formed between the mirror surface and the mirror back cover.

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